Heat treatment process for improving low temperature plasticity of selective laser melting forming GH4169 alloy

A GH4169, selected area laser melting technology, applied in the direction of improving energy efficiency, process efficiency, additive processing, etc., can solve problems such as low plasticity at low temperature, delay in model development cycle, and difficulty in timely delivery of products, and achieve comprehensive mechanical properties. Effect

Inactive Publication Date: 2019-02-12
CAPITAL AEROSPACE MACHINERY +1
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Problems solved by technology

During the development and production, the low-temperature (-196°C) performance test of the selected area laser melting and forming GH4169 product after conventional heat treatment fou...

Method used

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with specific embodiments.

[0023] According to the microstructure and phase transformation rules of GH4169 during heat treatment, it is found that the precipitation morphology, quantity, position and distribution of strengthening phases in different stages of heat treatment show different characteristics: the δ phase begins to dissolve at high temperature, while at low temperature The dissolution and precipitation of this phase directly affect the quantity and distribution of the main strengthening phase γ''. Therefore, starting from the microstructure and phase transformation law of the material itself under different heat treatment conditions, the low temperature plasticity can be improved by optimizing the heat treatment process. , the technical scheme is as follows:

[0024] Firstly, the microstructure and the amount of δ phase in the deposited material are regulated. Under the heat treatment c...

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Abstract

The invention belongs to the technical field of heat treatment of additive manufacturing advanced aerospace materials, and particularly relates to a heat treatment process for improving low temperature plasticity of a selective laser melting forming GH4169 alloy. The heat treatment process is used for significantly improving low temperature plasticity. The heat treatment process comprises the steps that 1, homogenization heat treatment is carried out on the selective laser melting forming GH4169 alloy; 2, solid solution heat treatment is carried out on the selective laser melting forming GH4169 alloy obtained after homogenization heat treatment; and 3, aging heat treatment is carried out on the selective laser melting forming GH4169 alloy obtained after homogenization and solid solution. According to the heat treatment process, the high temperature homogenization process is additionally arranged before conventional solid solution, system optimization is carried out on the heat preservation temperature and the holding time parameter of all processes, the ultra-low temperature plasticity of the selective laser melting forming GH4169 alloy is greatly improved, is greatly improved from10.5% to more than 20%, and is far higher than the design index requirements, it is ensured that the comprehensive mechanical properties of the products meet the design specification requirements, and the urgent need of the model to the materials is met.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of advanced aerospace materials for additive manufacturing, and specifically relates to a heat treatment process for improving the low-temperature plasticity of GH4169 alloy formed by selective laser melting, which is used to significantly improve its low-temperature plasticity. Background technique [0002] Selective laser melting forming GH4169 high-temperature alloy products have been widely used in heavy-duty launch vehicle engines under development in my country. Compared with forging + machining forming, this technology can significantly reduce the number of parts to achieve weight reduction. At the same time, this technology has the characteristics of near net shape Greatly reduce economic and development cycle costs. At present, the two types of heavy-duty engines are all liquid hydrogen and liquid oxygen engines, and the ultra-low temperature environment of liquid hydrogen and liqui...

Claims

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Application Information

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IPC IPC(8): C22F1/10B22F3/24B22F3/105B33Y10/00
CPCC22F1/10B22F3/24B33Y10/00B22F2003/248B22F10/00B22F10/28B22F10/64Y02P10/25
Inventor 马存强马彦东叶茂姜枫徐坤和王淑青李存良陈永栓杨凯郭凡王萍郁瑞兴田彩兰淡婷崔保伟
Owner CAPITAL AEROSPACE MACHINERY
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